"Wantage" Natural Recordings by Native Speakers
I couldn't find a definition for "wantage".
Unfortunately, "wantage" is not a commonly used word in the English language. It is possible that it was misspelled or is a proper noun.
That being said, here are 5 possible definitions for "wantage" if we assume it was meant to be "wantage" (as in "want", a verb):